body {
    margin: 0 auto;
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    font-family: -apple-system, Helvetica, sans-serif;
    color: #666;
    font-size: 14px;
}
header {
    width: 100%;
    height: 45px;
}
ul {
    margin: 0;
    padding: 0;
}
header ul li {
    float: left;
    list-style: none;
    background-color: #333333;
    height: 45px;
    text-align: center;
    line-height: 45px;
}
header ul li:nth-child(1) {
    width: 8%;
}
header ul li:nth-child(1) img {
    width: 10px;
}
header ul li:nth-child(2) img {
    width: 30px;
    vertical-align: middle;
}

header ul li:nth-child(2) {
    width: 10%;
}

header ul li:nth-child(3) {
    width: 55%;
    color: #fff;
}

header ul li:nth-child(4) {
    width: 27%;
    background-color: #f63515;
    color: #fff;
}
.search {
    position: fixed;
    overflow: hidden;
    width: 100%;
    max-width: 640px;
    min-width: 320px;
    text-align: center;
}
.search .nav {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
    line-height: 48px;
}
.search .nav img {
    width: 22px;
}
.search-box .jd img {
    width: 20px;
}
.search-box .jd {
    position: absolute;
    top: 8px;
    left: 10px;
    height: 15px;

}
.search-box .jd::after {
    content: "";
    position: absolute;
    top: 0;
    margin-left: 10px;
    height: 15px;
    width: 1px;
    background-color: #cccccc
}
.search .search-box {
    position: relative;
    margin: 7px 50px;
    height: 30px;
    border-radius: 15px;
    background-color: #fff;
}
.search .login {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    line-height: 44px;
    color: #fff;
}
.sou {
    position: absolute;
    top: 8px;
    left: 50px;
    width: 18px;
    height: 15px;
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px;
}
.slider img {
    width: 100%;
}
.brand {
    overflow: hidden;
    border-radius: 10px 10px 0 0;
}
.brand div {
    float: left;
    width: 33.33%;
}
.brand div img {
    width: 100%;
}
nav {
    margin-top: 5px;
}
nav .box {
    float: left;
    width: 20%;
    text-align: center;
    font-size: 14px;
}
nav .box p {
    margin: 8px 0;
}
nav .box img {
    width: 40px;
}
.new a {
    float: left;
    box-sizing: border-box;
}
.new a:nth-child(1) {
    width: 50%;
}
.new a:nth-child(n+2) {
    width: 25%;
    border-left: 1px solid #ccc;
}
.new a img {
    width: 100%;
}